/* roulang page: index */
:root{
      --brand:#ff6b4a;
      --brand-2:#ff9a62;
      --mint:#28c7a5;
      --sky:#5aa7ff;
      --purple:#8e70ff;
      --ink:#162033;
      --muted:#647084;
      --weak:#8c96a8;
      --bg:#fffaf5;
      --surface:#ffffff;
      --surface-2:#fff4ec;
      --border:rgba(22,32,51,.10);
      --shadow:0 18px 55px rgba(28,35,54,.10);
      --shadow-soft:0 12px 32px rgba(28,35,54,.08);
      --radius-xl:30px;
      --radius-lg:22px;
      --radius-md:16px;
      --radius-sm:12px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at 8% 6%, rgba(255,154,98,.22), transparent 30%),
        radial-gradient(circle at 90% 2%, rgba(40,199,165,.14), transparent 34%),
        linear-gradient(180deg,#fffaf5 0%,#ffffff 42%,#f7fbff 100%);
      line-height:1.75;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button,input{font:inherit}
    button{cursor:pointer}
    ::selection{background:rgba(255,107,74,.22)}
    .container-shell{max-width:var(--container);margin:0 auto;padding:0 22px}
    .skip-link{
      position:absolute;left:-999px;top:12px;z-index:999;
      background:var(--ink);color:#fff;padding:10px 14px;border-radius:12px
    }
    .skip-link:focus{left:16px}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:saturate(160%) blur(18px);
      background:rgba(255,250,245,.82);
      border-bottom:1px solid rgba(22,32,51,.08);
    }
    .brand-mark{
      width:42px;height:42px;border-radius:15px;
      display:grid;place-items:center;
      color:white;font-weight:900;
      background:linear-gradient(135deg,var(--brand),var(--brand-2) 58%,var(--mint));
      box-shadow:0 12px 28px rgba(255,107,74,.22);
    }
    .nav-tile{
      display:flex;align-items:center;gap:9px;
      padding:10px 14px;border:1px solid rgba(255,107,74,.18);
      border-radius:16px;background:rgba(255,255,255,.72);
      color:var(--ink);font-weight:800;font-size:14px;
      transition:.22s ease;
    }
    .nav-tile:hover,.nav-tile.active{
      transform:translateY(-2px);
      background:#fff;
      border-color:rgba(255,107,74,.42);
      box-shadow:0 12px 28px rgba(255,107,74,.13);
    }
    .nav-tile:focus-visible,.btn:focus-visible,.share-btn:focus-visible,input:focus-visible,summary:focus-visible{
      outline:3px solid rgba(40,199,165,.34);
      outline-offset:3px;
    }
    .search-pill{
      display:flex;align-items:center;gap:10px;
      padding:9px 12px;border-radius:999px;
      background:#fff;border:1px solid var(--border);
      box-shadow:0 8px 24px rgba(22,32,51,.05);
    }
    .search-pill input{
      width:210px;border:0;outline:0;background:transparent;color:var(--ink);
    }
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:9px;
      border:0;border-radius:999px;padding:13px 20px;
      font-weight:900;line-height:1.2;transition:.22s ease;
      white-space:nowrap;
    }
    .btn-primary{
      color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));
      box-shadow:0 14px 28px rgba(255,107,74,.26);
    }
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px rgba(255,107,74,.34)}
    .btn-soft{background:#fff;color:var(--ink);border:1px solid rgba(22,32,51,.09);box-shadow:var(--shadow-soft)}
    .btn-soft:hover{transform:translateY(-2px);border-color:rgba(40,199,165,.38)}
    .btn-dark{background:var(--ink);color:#fff;box-shadow:0 14px 28px rgba(22,32,51,.22)}
    .btn-dark:hover{transform:translateY(-2px);background:#0f1728}
    .section{padding:72px 0}
    .section-tight{padding:54px 0}
    .section-kicker{
      display:inline-flex;align-items:center;gap:8px;
      padding:7px 12px;border-radius:999px;
      background:rgba(255,107,74,.10);
      color:#d95031;font-weight:900;font-size:13px;
      border:1px solid rgba(255,107,74,.14);
    }
    .section-title{
      margin-top:14px;font-size:clamp(28px,4vw,44px);
      line-height:1.18;letter-spacing:-.03em;font-weight:950;
    }
    .section-desc{
      margin-top:14px;color:var(--muted);
      font-size:16px;max-width:780px;
    }
    .hero{
      position:relative;min-height:620px;
      display:flex;align-items:stretch;
      overflow:hidden;
      border-bottom-left-radius:42px;border-bottom-right-radius:42px;
    }
    .hero::before{
      content:"";position:absolute;inset:0;
      background:
        linear-gradient(115deg,rgba(22,32,51,.78) 0%,rgba(22,32,51,.48) 42%,rgba(255,107,74,.20) 100%),
        radial-gradient(circle at 78% 16%,rgba(255,255,255,.24),transparent 24%),
        linear-gradient(135deg,#ff8a5c 0%,#654dff 47%,#24c6a4 100%);
    }
    .hero::after{
      content:"";position:absolute;inset:0;
      background-image:
        linear-gradient(rgba(255,255,255,.13) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.13) 1px,transparent 1px);
      background-size:42px 42px;opacity:.25;mask-image:linear-gradient(90deg,#000,transparent 88%);
    }
    .hero-inner{position:relative;z-index:2;width:100%;display:flex;align-items:center;padding:58px 0 44px}
    .series-bar{
      position:absolute;left:22px;right:22px;top:26px;
      display:flex;align-items:center;gap:12px;overflow:auto;
      padding:10px;border-radius:22px;
      background:rgba(255,255,255,.13);
      border:1px solid rgba(255,255,255,.22);
      backdrop-filter:blur(14px);
    }
    .series-chip{
      flex:0 0 auto;display:inline-flex;align-items:center;gap:8px;
      color:#fff;font-weight:800;font-size:14px;
      padding:9px 13px;border-radius:999px;
      background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.16);
      transition:.2s ease;
    }
    .series-chip:hover{background:rgba(255,255,255,.24);transform:translateY(-1px)}
    .hero-panel{
      max-width:860px;margin-top:70px;
      padding:34px;border-radius:var(--radius-xl);
      background:linear-gradient(135deg,rgba(255,255,255,.18),rgba(255,255,255,.08));
      border:1px solid rgba(255,255,255,.22);
      box-shadow:0 30px 90px rgba(0,0,0,.20);
      backdrop-filter:blur(10px);
    }
    .hero-brand{
      display:inline-flex;align-items:center;gap:10px;color:#fff;
      font-weight:950;padding:8px 12px;border-radius:999px;
      background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.20);
    }
    h1{
      margin:18px 0 0;color:#fff;
      font-size:clamp(34px,6vw,64px);
      line-height:1.08;letter-spacing:-.045em;font-weight:950;
      max-width:820px;
    }
    .hero-lead{
      margin-top:20px;color:rgba(255,255,255,.90);
      font-size:18px;line-height:1.9;max-width:780px;
    }
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
    .hero-metrics{
      display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:28px;
    }
    .metric{
      border-radius:20px;padding:16px;background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.18);color:#fff;
    }
    .metric strong{display:block;font-size:24px;line-height:1.1;font-weight:950}
    .metric span{display:block;margin-top:6px;color:rgba(255,255,255,.78);font-size:13px}
    .floating-card{
      position:absolute;right:calc((100vw - min(var(--container),100vw))/2 + 22px);bottom:42px;
      width:300px;padding:18px;border-radius:26px;
      background:rgba(255,255,255,.92);border:1px solid rgba(255,255,255,.66);
      box-shadow:0 24px 70px rgba(0,0,0,.18);
      z-index:3;
    }
    .progress-line{height:9px;border-radius:999px;background:#eef1f5;overflow:hidden}
    .progress-line span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--mint),var(--brand));}
    .card{
      background:rgba(255,255,255,.88);
      border:1px solid var(--border);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow-soft);
      transition:.24s ease;
    }
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(255,107,74,.24)}
    .icon-badge{
      width:44px;height:44px;border-radius:16px;
      display:grid;place-items:center;font-size:20px;
      background:linear-gradient(135deg,rgba(255,107,74,.16),rgba(40,199,165,.14));
    }
    .catalog-grid{
      display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:18px;margin-top:26px;
    }
    .catalog-card{padding:24px;min-height:190px;position:relative;overflow:hidden}
    .catalog-card.large{grid-row:span 2;min-height:398px;background:linear-gradient(145deg,#fff,#fff0e7)}
    .catalog-card::after{
      content:"";position:absolute;width:150px;height:150px;border-radius:999px;
      right:-54px;bottom:-60px;background:rgba(255,107,74,.10);
    }
    .tag{
      display:inline-flex;align-items:center;gap:6px;
      padding:5px 10px;border-radius:999px;
      background:#f6f8fb;color:var(--muted);
      font-size:12px;font-weight:800;
    }
    .recommend-row{
      display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:26px;
    }
    .recommend-card{padding:20px}
    .recommend-card .num{font-size:13px;color:var(--weak);font-weight:900}
    .split-demo{
      margin-top:28px;display:grid;grid-template-columns:.92fr 1.08fr;gap:20px;align-items:stretch;
    }
    .demo-stage{
      min-height:360px;border-radius:32px;padding:26px;position:relative;overflow:hidden;
      background:
        radial-gradient(circle at 20% 20%,rgba(255,255,255,.72),transparent 20%),
        linear-gradient(135deg,#ff805b,#815eff 52%,#28c7a5);
      box-shadow:var(--shadow);
    }
    .demo-note{
      position:absolute;border-radius:22px;padding:14px 16px;
      background:rgba(255,255,255,.88);border:1px solid rgba(255,255,255,.55);
      box-shadow:0 14px 34px rgba(22,32,51,.13);
      max-width:230px;
    }
    .demo-note.one{left:26px;top:30px}
    .demo-note.two{right:24px;top:138px}
    .demo-note.three{left:54px;bottom:34px}
    .step-list{display:grid;gap:14px}
    .step-item{display:flex;gap:14px;padding:18px;border-radius:20px;background:#fff;border:1px solid var(--border)}
    .step-index{
      width:34px;height:34px;border-radius:12px;background:var(--ink);color:#fff;
      display:grid;place-items:center;font-weight:950;flex:0 0 auto;
    }
    details.faq-item{
      background:#fff;border:1px solid var(--border);border-radius:20px;
      padding:0;box-shadow:0 10px 28px rgba(22,32,51,.05);overflow:hidden;
    }
    details.faq-item + details.faq-item{margin-top:12px}
    details.faq-item summary{
      list-style:none;display:flex;align-items:center;justify-content:space-between;gap:18px;
      padding:18px 20px;font-weight:900;cursor:pointer;
    }
    details.faq-item summary::-webkit-details-marker{display:none}
    details.faq-item summary::after{
      content:"＋";width:28px;height:28px;display:grid;place-items:center;border-radius:10px;
      background:rgba(255,107,74,.10);color:var(--brand);flex:0 0 auto;
    }
    details.faq-item[open] summary::after{content:"－";background:rgba(40,199,165,.12);color:var(--mint)}
    .faq-answer{padding:0 20px 18px;color:var(--muted)}
    .entry-grid{
      display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:14px;margin-top:24px;
    }
    .entry{
      min-height:118px;padding:16px;border-radius:22px;background:#fff;border:1px solid var(--border);
      display:flex;flex-direction:column;justify-content:space-between;transition:.22s ease;
    }
    .entry:hover{transform:translateY(-3px);border-color:rgba(40,199,165,.34);box-shadow:var(--shadow-soft)}
    .task-wrap{
      margin-top:26px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px;
    }
    .task-card{padding:20px;position:relative;overflow:hidden}
    .task-card.done{background:linear-gradient(145deg,#fff,#effffb)}
    .news-wrap{
      margin-top:28px;display:grid;grid-template-columns:1.55fr .85fr;gap:22px;
    }
    .news-list{background:#fff;border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-soft)}
    .news-item{
      display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;
      padding:18px 20px;border-bottom:1px solid rgba(22,32,51,.08);
      transition:.2s ease;
    }
    .news-item:last-child{border-bottom:0}
    .news-item:hover{background:#fff8f3}
    .news-date{font-weight:950;color:var(--brand);font-size:13px}
    .news-title{font-weight:900}
    .news-title:hover{color:#d95031}
    .side-panel{padding:22px;background:linear-gradient(145deg,#172033,#26344d);color:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow)}
    .side-panel p{color:rgba(255,255,255,.74)}
    .share-box{
      border-radius:34px;padding:28px;
      background:
        linear-gradient(135deg,rgba(255,107,74,.12),rgba(40,199,165,.12)),
        #fff;
      border:1px solid rgba(255,107,74,.16);
      box-shadow:var(--shadow-soft);
    }
    .share-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
    .share-btn{
      border:1px solid var(--border);background:#fff;color:var(--ink);
      padding:12px 16px;border-radius:16px;font-weight:900;transition:.22s ease;
    }
    .share-btn:hover{transform:translateY(-2px);border-color:rgba(255,107,74,.35);box-shadow:var(--shadow-soft)}
    .site-footer{
      padding:52px 0 28px;background:#121b2b;color:#e8edf6;margin-top:0;
    }
    .footer-card{
      display:grid;grid-template-columns:1.2fr .8fr;gap:24px;
      padding:26px;border-radius:28px;background:rgba(255,255,255,.06);
      border:1px solid rgba(255,255,255,.10);
    }
    .footer-link{color:rgba(255,255,255,.72);transition:.2s ease}
    .footer-link:hover{color:#fff}
    .copy{margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.10);color:rgba(255,255,255,.58);font-size:13px}
    @media (max-width:1024px){
      .floating-card{display:none}
      .catalog-grid{grid-template-columns:1fr 1fr}
      .catalog-card.large{grid-row:auto;grid-column:span 2;min-height:250px}
      .recommend-row{grid-template-columns:repeat(2,minmax(0,1fr))}
      .entry-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
      .split-demo,.news-wrap,.footer-card{grid-template-columns:1fr}
      .task-wrap{grid-template-columns:1fr}
    }
    @media (max-width:768px){
      .container-shell{padding:0 16px}
      .site-header .head-line{flex-direction:column;align-items:stretch;gap:12px}
      .search-pill{width:100%}
      .search-pill input{width:100%}
      .nav-tile{justify-content:center}
      .hero{min-height:auto;border-bottom-left-radius:28px;border-bottom-right-radius:28px}
      .hero-inner{padding:86px 0 38px}
      .series-bar{top:14px;left:16px;right:16px;border-radius:18px}
      .hero-panel{padding:24px;margin-top:42px}
      .hero-lead{font-size:16px}
      .hero-metrics{grid-template-columns:1fr}
      .section{padding:54px 0}
      .catalog-grid{grid-template-columns:1fr}
      .catalog-card.large{grid-column:auto}
      .entry-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .news-item{grid-template-columns:1fr;gap:6px}
    }
    @media (max-width:520px){
      .brand-text{font-size:14px}
      .hero-actions,.share-actions{flex-direction:column}
      .btn,.share-btn{width:100%}
      .recommend-row{grid-template-columns:1fr}
      .entry-grid{grid-template-columns:1fr}
      .demo-stage{min-height:420px}
      .demo-note{left:18px!important;right:18px!important;max-width:none}
      .demo-note.two{top:154px}
      .demo-note.three{bottom:22px}
    }